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Vanilla 1.1.10 is a product of Lussumo. More Information: Documentation, Community Support.
added (here) the statement that every unital channel on a single qbit is mixed unitary.
This is attributed by Müller-Hermes & Perry 2019 (inside the proof of Cor. 1.4) to Ruskai, Szarek & Werner 2002, though it’s not terribly explicit in the latter article.
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